4L60E-HD2 Transmission performance reprogramming kit.Holds 1st, 2nd, and 3rd at any RPM. Backshifts to 3rd, 2nd and 1st at any RPM.1998 and newer may require TORQUE MANAGEMENT MODIFICATION.Designed for the professional mechanic.Comes with complete, easy to follow instructions.

4L60E Transmission performance reprogramming kitStick shift, full manual control, (converts back to automatic),holds 1st, 2nd, and 3rd at any RPM.Backshifts to 3rd, 2nd and 1st at any RPM.For transplant or use with non electrical application.Also order 46-MOD. Comes with complete, easy to follow instructions.Designed for the professional mechanic.

The 2-3 servo control valve regulates the apply of the low intermediate band. When the OE. Aluminum valve starts to stick and hang up in the bore the band does no reapply after a coast down. This occurrence causes a neutralizing condition at a stop. 2. The valve supplied with this problem solver kit is made of a highly polished steel to resist sticking in the valve body bore. 3. The 2-3 servo control valve has also been added to our popular Shift Correction Package.